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LibWeb: Cache display list commands per paintable

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Cache the display list commands produced by each PaintableBox's paint()
on a per-phase basis. On subsequent display list rebuilds, if a
paintable's cache is still valid, replay the recorded commands directly
— skipping paint() and all the property resolution it entails.

Besides saving time on property resolution, this also enables Skia to
reuse path tessellation results across frames — e.g. border paths are
preserved in the cache and don't need to be re-tessellated on every
repaint.
This commit is contained in:
Aliaksandr Kalenik
2026-03-03 13:30:31 +01:00
committed by Alexander Kalenik
parent eae94a8a46
commit 5bfc4a3c41
Notes: github-actions[bot] 2026-03-04 18:36:56 +00:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/LadybirdBrowser/ladybird/commit/5bfc4a3c41b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8271
14 changed files with 161 additions and 12 deletions
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6
Libraries/LibWeb/DOM/Document.cpp
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@@ -182,6 +182,7 @@
#include <LibWeb/Painting/AccumulatedVisualContext.h>
#include <LibWeb/Painting/DisplayList.h>
#include <LibWeb/Painting/DisplayListCommand.h>
#include <LibWeb/Painting/DisplayListRecorder.h>
#include <LibWeb/Painting/PaintableBox.h>
#include <LibWeb/Painting/StackingContext.h>
#include <LibWeb/Painting/ViewportPaintable.h>
@@ -7306,6 +7307,11 @@ void Document::invalidate_display_list()
return;
if (auto container = navigable->container()) {
// The container's paintable may have cached paint commands that include a PaintNestedDisplayList
// holding a stale reference to this document's old display list. Clear the cache so the container
// re-executes paint() and picks up the freshly recorded display list.
if (auto* paintable_box = container->unsafe_paintable_box())
paintable_box->invalidate_paint_cache();
container->document().invalidate_display_list();
}
}